Stuttgart 2012 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 28: Präzisionsmessungen und Metrologie 4

Q 28.1: Vortrag

Dienstag, 13. März 2012, 14:00–14:15, V47.02

Passive Ring-Laser Stabilization to Sub-kHz Linewidths with Whispering Gallery Mode Resonators — •Michele C. Collodo1,2, Benjamin Sprenger3, Florian Sedlmeir1,2, Sergiy Svitlov2, Harald G. L. Schwefel1,2, and L. J. Wang41Max Planck Institut für die Physik des Lichts, Erlangen, Deutschland — 2Universität Erlangen-Nürnberg, IOIP, Erlangen, Deutschland — 3Humboldt-Universität zu Berlin, Institut für Physik, AG Nanooptik, Berlin, Deutschland — 4Physics Department and Joint Inst. of Measurement Science (JMI), Tsinghua University, Beijing, 100084 China

A dielectric whispering gallery mode (WGM) resonator is able to confine light due to total internal reflection at its dielectric interface. In order to achieve high quality (Q) factors in the range of 108 and above we use crystalline CaF2 disk resonators, which provide very low intrinsic absorption losses. Such an evanescently coupled millimeter sized WGM disk resonator can be used as a passive filtering element in an erbium-doped fiber ring laser. This system sustains single mode lasing without the usage of active stabilization techniques.

The resulting lasing linewidth is determined via a three-cornered-hat measurement. We record the beat notes resulting from the combination of all the three different lasing sources working around 1530nm; two self-built WGM resonator lasers and a commercial laser. An evaluation utilizing the Allan Deviation yields a relative frequency stability of 3.28×10−12 after 16 µs integration time. This corresponds to a lasing linewidth of 643Hz.

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